Genome-Wide Identification, Characterization, and Expression Analysis of the Family Genes Under Abiotic Stresses in

The BRI1 EMS suppressor 1(BES1) transcription factor is a crucial regulator in the signaling pathway of Brassinosteroid (BR) and plays an important role in plant growth and response to abiotic stress. Although the identification and functional validation of genes have been extensively explored in various plant species, the understanding of their role in woody plants-particularly the endangered species (Hemsl.) Yang-remains limited. In this study, we identified nine members of the gene family in the genome of ; these nine members were unevenly distributed across four chromosomes. In our further evolutionary analysis of , we discovered that can be divided into three subfamilies (Class I, Class II, and Class IV) based on the evolutionary tree constructed with , , and . Each subfamily contains 2-5 genes. There were nine pairs of homologous genes in the synteny analysis of and . Three segmental replication events and one pair of tandem duplication events were present among the family members. Additionally, we conducted promoter -acting element analysis and discovered that contains binding sites for plant growth and development, cell cycle regulation, and response to abiotic stress. is highly expressed in root bark, stem bark, root xylem, and stem xylem. was expressed in five tissues. Moreover, we examined the expression profiles of five representative genes under heat and drought stress. These experiments preliminarily verified their responsiveness and functional roles in mediating responses to abiotic stress. This study provides important clues to elucidate the functional characteristics of the gene family, and at the same time provides new insights and valuable information for the regulation of resistance in .